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23-07-2018
Mathematics

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Find the angle between two vectors [see attachment]
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Find the angle between two vectors see attachment Please help class=

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23-07-2018

Angle = arccos (dot product / product of the magnitues)

dot product = 1*-1 + 9*sqrt7 = 22.812

product of the magnitudes = sqrt(1 + 7) * sqrt(1 + 82) = 25.612

required angle = arccos (22.812/25.612) = 27 degrees to nearest degree

Its choice b.

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